From the south edge of Manhattan, go 1.8 miles on K-177. Turn east onto onto Riley County 911 for about 4 miles until the intersection with Pillsbury Crossing Road (it is easy to miss the intersection). Take Pillsbury Crossing ~2 miles.
Pillsbury crossing is where Deep Creek flows over a small drop, around 4' forming nice "waterfalls". Go early in the spring after when the foliage is really green and spring rains are producing a lot of water. Note poison ivy is everywhere! There is a small park nearby and hiking trail as well as the "waterfalls."